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DERIVATIVE FINANCIAL INSTRUMENTS (Schedule of Outstanding Derivative Instruments and Cash Collateral) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jul. 01, 2018
Dec. 25, 2016
Dec. 31, 2017
Fair values:      
Collateral posted with brokers $ 33,185   $ 8,021
Corn      
Derivatives Coverage:      
Derivatives coverage (as a percentage) 24.70% 3.10%  
Period through which stated percent of needs are covered:      
Maturity date Mar. 31, 2019 Mar. 31, 2019  
Soybean meal      
Derivatives Coverage:      
Derivatives coverage (as a percentage) 18.40% 1.70%  
Period through which stated percent of needs are covered:      
Maturity date Jul. 30, 2019 Dec. 31, 2018  
Commodity      
Fair values:      
Derivative assets, gross $ 18,678   722
Derivative liabilities, gross (42,561)   (3,847)
Foreign currency      
Fair values:      
Derivative assets, gross 527   45
Derivative liabilities, gross $ (278)   $ (211)